Bump Asciidoctor version to 2.0.20

[asciidoctor-updateclibot[bot]]

Bump Asciidoctor version

Update the value of ARG asciidoctor_version in the Dockerfile

2.0.20

Release published on the 2023-05-18 07:19:00 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor/releases/tag/v2.0.20

After the 2.0.19 release, we discovered that the man page was not being updated during the release. This release has no changes other than t fix the release process. For changes related to 2.0.19, see https://github.com/asciidoctor/asciidoctor/releases/tag/v2.0.19.

## Distribution

- [RubyGem (asciidoctor)](https://rubygems.org/gems/asciidoctor)

Asciidoctor is also packaged for [Fedora](https://apps.fedoraproject.org/packages/rubygem-asciidoctor), [Debian](https://packages.debian.org/sid/asciidoctor), [Ubuntu](https://packages.ubuntu.com/search?keywords=asciidoctor), [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=asciidoctor), [OpenSUSE](https://software.opensuse.org/package/rubygem-asciidoctor), and [Homebrew](https://formulae.brew.sh/formula/asciidoctor). You can use the system's package manager to install the package named **asciidoctor**.

## Changelog

### Bug Fixes

   * Update `release-version` attribute in READMEs and man page during release
   * Rebuild man page during release

## Release meta

Released on: 2023-05-18
Released by: @mojavelinux
Release beer: Yerba Mate IPA by Athletic Brewing

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor/issues?q=is%3Aissue+label%3Av2.0.20+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor/compare/v2.0.19...v2.0.20) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.0.19/v2.0.20)

## Credits

A very special thanks to all the **awesome** [supporters of the Asciidoctor OpenCollective campaign](https://opencollective.com/asciidoctor), who provide critical funding for the ongoing development of this project.

Update the key ASCIIDOCTOR_VERSION in the test harness

2.0.20

Release published on the 2023-05-18 07:19:00 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor/releases/tag/v2.0.20

After the 2.0.19 release, we discovered that the man page was not being updated during the release. This release has no changes other than t fix the release process. For changes related to 2.0.19, see https://github.com/asciidoctor/asciidoctor/releases/tag/v2.0.19.

## Distribution

- [RubyGem (asciidoctor)](https://rubygems.org/gems/asciidoctor)

Asciidoctor is also packaged for [Fedora](https://apps.fedoraproject.org/packages/rubygem-asciidoctor), [Debian](https://packages.debian.org/sid/asciidoctor), [Ubuntu](https://packages.ubuntu.com/search?keywords=asciidoctor), [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=asciidoctor), [OpenSUSE](https://software.opensuse.org/package/rubygem-asciidoctor), and [Homebrew](https://formulae.brew.sh/formula/asciidoctor). You can use the system's package manager to install the package named **asciidoctor**.

## Changelog

### Bug Fixes

   * Update `release-version` attribute in READMEs and man page during release
   * Rebuild man page during release

## Release meta

Released on: 2023-05-18
Released by: @mojavelinux
Release beer: Yerba Mate IPA by Athletic Brewing

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor/issues?q=is%3Aissue+label%3Av2.0.20+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor/compare/v2.0.19...v2.0.20) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.0.19/v2.0.20)

## Credits

A very special thanks to all the **awesome** [supporters of the Asciidoctor OpenCollective campaign](https://opencollective.com/asciidoctor), who provide critical funding for the ongoing development of this project.

Update the key ASCIIDOCTOR_VERSION in the README.adoc file

2.0.20

Release published on the 2023-05-18 07:19:00 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor/releases/tag/v2.0.20

After the 2.0.19 release, we discovered that the man page was not being updated during the release. This release has no changes other than t fix the release process. For changes related to 2.0.19, see https://github.com/asciidoctor/asciidoctor/releases/tag/v2.0.19.

## Distribution

- [RubyGem (asciidoctor)](https://rubygems.org/gems/asciidoctor)

Asciidoctor is also packaged for [Fedora](https://apps.fedoraproject.org/packages/rubygem-asciidoctor), [Debian](https://packages.debian.org/sid/asciidoctor), [Ubuntu](https://packages.ubuntu.com/search?keywords=asciidoctor), [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=asciidoctor), [OpenSUSE](https://software.opensuse.org/package/rubygem-asciidoctor), and [Homebrew](https://formulae.brew.sh/formula/asciidoctor). You can use the system's package manager to install the package named **asciidoctor**.

## Changelog

### Bug Fixes

   * Update `release-version` attribute in READMEs and man page during release
   * Rebuild man page during release

## Release meta

Released on: 2023-05-18
Released by: @mojavelinux
Release beer: Yerba Mate IPA by Athletic Brewing

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor/issues?q=is%3Aissue+label%3Av2.0.20+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor/compare/v2.0.19...v2.0.20) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.0.19/v2.0.20)

## Credits

A very special thanks to all the **awesome** [supporters of the Asciidoctor OpenCollective campaign](https://opencollective.com/asciidoctor), who provide critical funding for the ongoing development of this project.

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